HOLLYWOOD, Aug. 11, 2000 -- What would the supermarket tabloids do without Whitney and Bobby? The National Enquirer's ace investigative reporters have gone to great lengths to obtain exclusive photos of the R&B power couple’s alleged "drug den," a hotel suite the pair rented for two days (while their daughter stayed in an adjacent suite). And here’s what the Enquirer reportedly found: remnants of marijuana, rolling papers, an empty Jack Daniels bottle, 16 empty Budweiser bottles, baking soda an